Tool holder for double-stroke solid-die headers



.TCOL HOLDER FOR .DOUBLE STROKE SOLID DIE HEADERS Filed Salat.

vf Eff titl ' gated.

liatented May 14, 1929.

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'VILLE MACHINE CMIIERAN'Y, ONNETICUT.

.Application tiled` tient-einher t?, 192V.

This invention relates to the means which are employed 'for holding,rthe dies in place in double stroke solid die metal heading; machines,and more particularly dies which are `provided for heading andentredinei sections ont the metallot the blanks which are acted. upon inthe machines.

The invention is specifically illustrated and described. herein. asapplied to the tormingr of blanks for bolts and can screws wh ich are tobe roll threaded.` Manu'tacturers et bolts and cap screws tind that rollthreads are cheaper and more acceptable than cut threads in that theyare more rapidly made and are stronger, and that it is easier tomaintain the sizes standard.

Blanks for such articles have the sections 'which are to be threadedreduced in diameter as rolling; the threads Gauss an increase etdianieter.` To accomplish this the bodies oit the blanks are forced intodies `and the sections oit the metal to be subsequently threaded areextruded, that is, are slightly reduced in diameter and elonln practicethe dies are made separable, that which. reduces the diameter of theblanks is made from relatively mild carbon steel that is tough andsomewhat elastic. While that surrounding the body portion oil the blanksnot to be threaded and against which the heads et the blanks are termed,is made of relatively high carbon steel which ismuch harder than themetal of the entruding die. This enables the entrudine: die which Wearsaway so that its gauge isimpaired very muehmore rapidly than the headingdie7 te be removed and reground or another substituted.

The object of the present invention is to provide a simple means torholding; these dies in a heading machine in such manner that While theyare firmly and securely retained they may be readily removed ierreplacement or substitution according to their Wear.

In the accompanyinp,` drawings iria'. l is a plan view oi" the iront endoi a heading; machine trame with a die block containing dies held inplace according` to this iinvention. Fie. 2 shows a front view oi thedie block. Fig. 3 is a section through the front end of the machineframe, the die block, the dies in the block, and the means tor removablyholding,r the dies in place. This view also indicates the Winches whichare used .in machines et this character.

'lhe die block l is set in a recess in the trontend 9; ol the machinetraine and is secured therein by bolts 3, after its vertical adjustmenthas been determined by the screw The die 5 with a perforation 6 the sizeoi Jthe unthreaded section oi the blank, is forced into the die block'from the back. 'lhe head of the blank termed against this die and inpractice it is made oitA relatively high carbon steel so that it 'willbe suiiieiently hard to withstand. the blows olf' the service to whichit is subjected. The die i `with a bell .mouth 8, and the perfor-a tion9 oi the diameter et the section ol the blank to be threaded, is placedin die block back oit the headinga die. This is the eX- trudingr diewhich reduces the diameter the required length and somewhat clon gatesthe biank. In practice the enti-udine die is made ot relatively lowcarbon steel, that is7 it is slightiy sorter than the heading` die, inorder that the transverse expansive strains to which it is subjectedwhen it is reducing' the biank Wili not injure the die and die block.lit the heading die were as soft as the enti-riding die it would notwithstand the blows to which it is subjected during the heading"operation, and if the entruding die were as bardas the headingl die mustbe it would be liable to fracture the die block.

it filling' die l() inserted in a rectangular backing block li, is1ilaced in the die block back oi the extrudine die. This 'filling diemay, in practice7 be of steel having substan tiaily the samecharacteristics as the headinga die tor it is not required to resistsuch heavy transverse expanding strains as is the eirtrudingr die. Therear tace of the backing' block is tapered and between this tace `andthe inner tace of the front end oi the 'frame is a wedge l2. This Wedgeat its upper end has a ii e'e ld through which a screw lll is turnedagainst a hardened `piece l5 set at the top oi the trame. By means oilthis screw the wedge is drawn up so as to force the backing; block anddies hrinly into the die block.

rlfhe entrudinfr die being of relatively soit steel and beirgiY requiredto resist heavy transverse expansive strains wears very much faster thanthe headingr die and Athe illing die and as it is necessary to keep itto size the extruding die must be removed at intervals and reground oranother' filling die substituted. lVith the construction illustratedwhen the eXtruding die becomes worn the die block is removed and thebacking Vblock with the filling` die and the extruding die are removedfrom the die block. The bell mouth tace of the extruding die is thenground ofi' and reamed to restore the opening to its proper size. thenthe parts are reassembled and the die block is metal heading machine ofa die block, means for adjusting the die block vertically, a solidheading die located in a recess in the die block,a solid'extruding dielocated in the Vrecess inthe die block back of the heading die, abacking block with an inclined rear face located in the die block backof the extruding die and a vertically adjustable Wedge located betweenthe inclined face of thebacking block and-the frame of the machine,whereby the heading die and extruding die may be locked in the die blockby the wedge regardless of variations in thickness of the extruding dieor ot' the adjust- 'ment of the die bloc 2. The combination with` theframe of a metal heading machine of a die block, means for adjusting thedie block vertically, a solid heading die located in a recess in the dieblock, a solid extruding die located in the .recess in the die blockback of the heading die, a backing block with an inclined rear facelocated in the die block back vof the extruding' die, aqverticallymovable wedge y located vbetween the inclined face of thebacking blockand the frame of the machine, and a screw for drawingthe wedge intoengagement with the inclined Vtace of the backing block, whereby theheading die and eX- truding die may be locked in the die block by thewedge regardless ot variations in thickness of the extruding die or ofthe adj usjment of the wedge.

3. The combination with the frame of a metal heading machine ot a dieblock, means for adjusting the die block vertically, a solid heading dielocated in a recess in thel die block, ay solid extruding die located inthe recess in the die block back of the heading die, a filling dielocated in the recess of the die block back of the extruding die, abacking block with an inclined rear face located in the die block backof the extruding die, a vertically movable wedge located between theinclined face of the backing block and the frame of the machine, and ascrew for drawing the wedge into engagement with the inclined face ofthe backing block, whereby the heading die and extruding die may belocked in the die block by the wedge regardless of variations inthickness of the cxtruding die or of the adjustment ol' the die block.

et. The combination with the frame of a metal heading machine of a dieblock, means for adjusting the die block vertically, a. solid headingdie of hard steel, located in a recess in the die block, a solidextruding die of softer steel located in the recess in the die blockback of the heading die, a backing block with an inclined rear facelocated in the die block back oit the extruding die, a wedge locatedbetween the inclined face of the backing block and the frame of themachine, and means for drawing the wedge into engagement with theinclined face of the backing block, whereby the heading die andextruding die may be locked in the die block by the wedge regardless ofvariations in thickness of the extruding die.

CHARLES T. BRENNAN.

